It is not your place to divulge anything. It is for FIL and MIL place to divulge. Are you one of those people who has something so juicy to tell, you want to tell to prove how important you are? Or you someone trustworthy of a secret and can keep it? Keep it to yourself. It will not eat you alive.
If I only wanted to tell people to “prove how important I was” why am struggling to decided if I should tell people??? This is my husband I’m not worried about “being trustworthy” to anyone else